you have a long list, much of which IMO should not need to be told but all to often needs to be.Much of this is personal preference and/or safety level.I typically don't use the tail stock (kind of defeats the purpose of the vac chuck)

Filters, Filter/s are there to keep debris from entering and damaging the internal workings of the pump. You only need one filter installed between the pump and the suction, putting a filter before the gauge is not necessary (actually useless). If you use a manifold or gauge block you might want to use one to keep the fixture clean but it is not necessary. As long as a filter is the last thing in line before the pump inlet, that is all that is necessary.

My vac gauge is mounted at the head stock in plain unobstructed view.

I won't get into using sharp tools or inspecting wood for defects, this should be done with every piece, regardless of mounting method.

I don't apply finish with the piece mounted to the vac chuck so I won't comment on that practice.

Thanks for the review Ed. My audience will be of all levels, so while many of these are obvious to those who use a vacuum system, I want to include info for those considering purchasing a system. I want to be sure that they know the limits.

I am accepting and requesting that anyone add to this list. I may send the completed list to the Safety Topics list on this site - for "safe keeping".

Ron - That would be a vacuum reservoir. It slows the loss of the vacuum if power is lost. I don't have one, however I work in a space (garage) that has no windows. So, if the power goes out, it goes PITCH BLACK.

Not sure if I could react to catch my turning, or if my reactions would be better spend just stepping towards the tailstock and out of the way

This is kind of like training kitchen help not to try to grab a knife when one drops....... For many turners they will first reaction try to save the piece. The better answer to practice is to get behind the tail stock.